Community List

About this task

A BGP community is a group of routes sharing a common attribute. The BGP list enables an administrator to assign names to community lists and increase the number of community lists configurable. A community list can be configured with regular expressions and numbered community lists. All the rules in numbered communities apply to named community lists, except there is no limitation in the number of community attributes configurable for a named community list.

To define a BGP community list:

Procedure

  1. Select Configuration > Network > BGP > Community List.
    Click to expand in new window
  2. Select Add to create a new community list or Edit to modify the attributes of a selected list. Existing lists can be copied or renamed as needed.
    Click to expand in new window
  3. Define whether the list is Standard or Expanded.
    Standard community lists specify known communities and community numbers. Expanded community lists filter communities using a regular expression that specifies patterns to match the attributes of different communities.
  4. Set the following Community List settings:
    Community Id Provide a community ID unique to this particular rule. The following are available:
    • internet - Advertises this route to the Internet. This is a global community.
    • local-AS - Prevents the transmit of packets outside the local AS.
    • no-advertise - Do not advertise this route to any peer, either internal or external.
    • no-export - Do not advertise to BGP peers (keeping) this route within an AS.
    • aa:nn - The first part (aa) represents the AS number. The second part (nn) represents a 2-byte number.
    Allow Use the drop-down menu to Permit or Deny requests for the community ID. The default setting is deny.
  5. Click OK to save the changes, Reset to revert to the last saved configuration or Exit to close the screen.
9036512-01 Rev AB